Difference Between 50 and 60 Hz Transformer No-Load Noise Levels

摘要

An unexplained difference between noise levels of 50 and 60 Hz transformers was presented in the previous published work of CIGRE workgroup A2.54 titled 'No-load sound power levels for specification purposes derived from more than 1000 measurements-a representative figure for three-phase transformers'. The purpose of this paper is to provide further explanation of this phenomenon based on predictable and unpredictable effects, which are the source of the observed no-load noise difference between 50 and 60 Hz transformers.